74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
// Copyright 2015-2018 The NATS Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package protobuf
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import (
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"errors"
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"github.com/golang/protobuf/proto"
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"github.com/nats-io/go-nats"
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)
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// Additional index for registered Encoders.
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const (
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PROTOBUF_ENCODER = "protobuf"
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)
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func init() {
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// Register protobuf encoder
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nats.RegisterEncoder(PROTOBUF_ENCODER, &ProtobufEncoder{})
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}
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// ProtobufEncoder is a protobuf implementation for EncodedConn
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// This encoder will use the builtin protobuf lib to Marshal
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// and Unmarshal structs.
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type ProtobufEncoder struct {
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// Empty
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}
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var (
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ErrInvalidProtoMsgEncode = errors.New("nats: Invalid protobuf proto.Message object passed to encode")
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ErrInvalidProtoMsgDecode = errors.New("nats: Invalid protobuf proto.Message object passed to decode")
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)
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// Encode
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func (pb *ProtobufEncoder) Encode(subject string, v interface{}) ([]byte, error) {
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if v == nil {
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return nil, nil
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}
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i, found := v.(proto.Message)
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if !found {
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return nil, ErrInvalidProtoMsgEncode
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}
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b, err := proto.Marshal(i)
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if err != nil {
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return nil, err
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}
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return b, nil
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}
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// Decode
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func (pb *ProtobufEncoder) Decode(subject string, data []byte, vPtr interface{}) error {
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if _, ok := vPtr.(*interface{}); ok {
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return nil
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}
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i, found := vPtr.(proto.Message)
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if !found {
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return ErrInvalidProtoMsgDecode
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}
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return proto.Unmarshal(data, i)
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}
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